Eichener See, Periodic karst lake near Eichen, Germany
The Eichener See is a temporary inland lake in a doline depression near Schopfheim, formed by groundwater emergence. The basin is surrounded by gentle slopes and shows varying water depths depending on the season.
The lake was first scientifically documented in 1782 by Heinrich Sander, sparking academic interest in the site. Its nature as a temporary lake that appears and disappears based on groundwater levels makes it a remarkable phenomenon of local geology.
The lake serves as a local nature-watching spot where walkers and families gather during the months when water is present. The area draws nature enthusiasts eager to experience this ever-changing natural landscape.
The area is accessible by bus line 7335 from Schopfheim, heading toward Wehr or Bad Säckingen. Visitors should note that depending on the season and groundwater levels, the lake may be dry or filled with water, so checking conditions beforehand is wise.
The water is home to Tanymastix lacunae, a rare crustacean species discovered in 1911 found nowhere else in the country. These tiny organisms survive the dry periods as resilient eggs resting in the lake floor sediments.
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